<!DOCTYPE html>
<html>
<head>
<title>CSS水平垂直居中</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<style type="text/css">
html,
body,
h1,
h2,
h3,
h4,
h5,
h6,
p,
blockquote,
ol,
ul,
li,
img {
  margin: 0;
  padding: 0;
  font-size: 100%;
  font: inherit;
}

html * {
  font-family: "ff-din-web-pro-1", "ff-din-web-pro-2", sans-serif;
  font-size: 16px;
  line-height: 19.2px;
  color-profile: sRGB;
  /*color: #657b83;*/
}

body {
  min-width: 32em;
  max-width: 56em;
  margin: 10px auto;
}

p, blockquote p {
  line-height: 1.6;
}

ul, ol {
  margin: 16px 0;
}

ul li, ol li {
  line-height: 1.6;
}

p, li {
  font-weight: lighter;
  margin: 10px 0;
}

strong {
  font-weight: bold;
}

ol,
ul {
  margin-left: 2em;
}

h1,
h2,
h3,
h4,
h5,
h6 {
  font-weight: lighter;
  text-transform: capitalize;
  margin: 20px 0;
  border-bottom: 1px solid;
  padding-bottom: 6px;
}

h1, h1 > code {
  font-size: 24.624px;
  line-height: 29.548799999999996px;
}

h2, h2 > code {
  font-size: 24.624px;
  line-height: 29.548799999999996px;
}

h3, h3 > code {
  font-size: 23.44px;
  line-height: 28.128px;
}

h4, h4 > code {
  font-size: 22.16px;
  line-height: 26.592px;
}

h5, h5 > code {
  font-size: 22.16px;
  line-height: 26.592px;
}

h6, h6 > code {
  font-size: 22.16px;
  line-height: 26.592px;
}

img {
  margin-bottom: 20px;
}

h1 img,
h2 img,
h3 img,
h4 img,
h5 img,
h6 img,
p img {
  margin-bottom: 0;
}

pre,
code {
  font-family: monospace, Consolas, "Source Code Pro", Arial, sans-serif;
  color: #aa5d00;
  /*color: #b58900;*/
  background-color: #eee8d5;
}

pre {
  white-space: pre-wrap;
  word-wrap: break-word;
  padding: 12px;
  margin-bottom: 20px;
}

code {
  border-radius: 3px;
}

h1 {
  text-transform: uppercase;
  font-weight: bold;
}

h3,
h4,
h5,
h6 {
  border-bottom: none;
}

html body {
  background-color: #fdf6e3;
}

html h1,
html h2,
html h3,
html h4,
html h5,
html h6 {
  color: #586e75;
  border-color: #657b83;
}

html a,
html a:active,
html a:visited {
  color: #586e75;
  text-decoration: none;
  border-bottom: 1px dashed;
  border-radius: 2px;
}

html a:hover {
  background-color: #eee8d5;
}

blockquote a:hover {
  background-color: #fdf6e3;
}

html a,
html a:active,
html a:visited,
html code.url {
  color: #b58900;
}

html h1 {
  color: #b58900;
}

html h2,
html h3,
html h4,
html h5,
html h6 {
  color: #b58900;
}

/* QUOTES
=============================================================================*/
blockquote {
  border-left: 4px solid #b58900;
  padding: 12px;
  background: #eee8d5;
  border-bottom-right-radius: 2px;
}

blockquote code {
  background: #fdf6e3;
}

blockquote > :first-child {
  margin-top: 0;
}

blockquote > :last-child {
  margin-bottom: 0;
}

/* TABLES
=============================================================================*/
table {
  margin: 0 auto;
  border-collapse: collapse;
  width: 100%;
  box-sizing: border-box;
  margin-bottom: 30px;
}

table th, table td {
  border: 1px solid #ccc;
  padding: 6px 13px;
}

table td {
  word-break: break-word;
  line-height: 1.3;
}

table th {
  font-weight: bold;
  text-align: center !important;
  background-color: #eee8d5;
}

table tr {
  border-top: 1px solid #ccc;
  background-color: #fdf6e3;
}

/* IMAGES
=============================================================================*/
img {
  max-width: 100%;
}

p > img {
  display: table;
  margin: 0 auto;
}

p code, li code, td code {
  padding: 1px 3px;
  border-radius: 3px;
}

.cp_embed_wrapper {
  margin: 20px 0;
}

.hljs {
  background: #eee8d5 !important;
}

@media screen and (min-width: 980px) and (max-width: 980px) {
  table thead tr th,
  table thead tr th > code,
  table tbody tr td,
  table tbody tr td > code,
  table tbody tr td > strong {
    font-size: 1.3em;
    line-height: 1.3;
  }

  ul li, ol li,
  pre > code,
  ul li pre > code,
  ol li pre > code,
  ul li > code,
  ol li > code,
  p, p code,
  p strong, p strong > code,
  blockquote p {
    font-size: 1.3em;
    line-height: 1.6;
  }

  ul {
    margin-left: 3.4em;
  }

  ol {
    margin-left: 3.6em;
  }
}
</style>
<style type="text/css">
.highlight  { background: #ffffff; }
.highlight .c { color: #999988; font-style: italic } /* Comment */
.highlight .err { color: #a61717; background-color: #e3d2d2 } /* Error */
.highlight .k { font-weight: bold } /* Keyword */
.highlight .o { font-weight: bold } /* Operator */
.highlight .cm { color: #999988; font-style: italic } /* Comment.Multiline */
.highlight .cp { color: #999999; font-weight: bold } /* Comment.Preproc */
.highlight .c1 { color: #999988; font-style: italic } /* Comment.Single */
.highlight .cs { color: #999999; font-weight: bold; font-style: italic } /* Comment.Special */
.highlight .gd { color: #000000; background-color: #ffdddd } /* Generic.Deleted */
.highlight .gd .x { color: #000000; background-color: #ffaaaa } /* Generic.Deleted.Specific */
.highlight .ge { font-style: italic } /* Generic.Emph */
.highlight .gr { color: #aa0000 } /* Generic.Error */
.highlight .gh { color: #999999 } /* Generic.Heading */
.highlight .gi { color: #000000; background-color: #ddffdd } /* Generic.Inserted */
.highlight .gi .x { color: #000000; background-color: #aaffaa } /* Generic.Inserted.Specific */
.highlight .go { color: #888888 } /* Generic.Output */
.highlight .gp { color: #555555 } /* Generic.Prompt */
.highlight .gs { font-weight: bold } /* Generic.Strong */
.highlight .gu { color: #aaaaaa } /* Generic.Subheading */
.highlight .gt { color: #aa0000 } /* Generic.Traceback */
.highlight .kc { font-weight: bold } /* Keyword.Constant */
.highlight .kd { font-weight: bold } /* Keyword.Declaration */
.highlight .kp { font-weight: bold } /* Keyword.Pseudo */
.highlight .kr { font-weight: bold } /* Keyword.Reserved */
.highlight .kt { color: #445588; font-weight: bold } /* Keyword.Type */
.highlight .m { color: #009999 } /* Literal.Number */
.highlight .s { color: #d14 } /* Literal.String */
.highlight .na { color: #008080 } /* Name.Attribute */
.highlight .nb { color: #0086B3 } /* Name.Builtin */
.highlight .nc { color: #445588; font-weight: bold } /* Name.Class */
.highlight .no { color: #008080 } /* Name.Constant */
.highlight .ni { color: #800080 } /* Name.Entity */
.highlight .ne { color: #990000; font-weight: bold } /* Name.Exception */
.highlight .nf { color: #990000; font-weight: bold } /* Name.Function */
.highlight .nn { color: #555555 } /* Name.Namespace */
.highlight .nt { color: #000080 } /* Name.Tag */
.highlight .nv { color: #008080 } /* Name.Variable */
.highlight .ow { font-weight: bold } /* Operator.Word */
.highlight .w { color: #bbbbbb } /* Text.Whitespace */
.highlight .mf { color: #009999 } /* Literal.Number.Float */
.highlight .mh { color: #009999 } /* Literal.Number.Hex */
.highlight .mi { color: #009999 } /* Literal.Number.Integer */
.highlight .mo { color: #009999 } /* Literal.Number.Oct */
.highlight .sb { color: #d14 } /* Literal.String.Backtick */
.highlight .sc { color: #d14 } /* Literal.String.Char */
.highlight .sd { color: #d14 } /* Literal.String.Doc */
.highlight .s2 { color: #d14 } /* Literal.String.Double */
.highlight .se { color: #d14 } /* Literal.String.Escape */
.highlight .sh { color: #d14 } /* Literal.String.Heredoc */
.highlight .si { color: #d14 } /* Literal.String.Interpol */
.highlight .sx { color: #d14 } /* Literal.String.Other */
.highlight .sr { color: #009926 } /* Literal.String.Regex */
.highlight .s1 { color: #d14 } /* Literal.String.Single */
.highlight .ss { color: #990073 } /* Literal.String.Symbol */
.highlight .bp { color: #999999 } /* Name.Builtin.Pseudo */
.highlight .vc { color: #008080 } /* Name.Variable.Class */
.highlight .vg { color: #008080 } /* Name.Variable.Global */
.highlight .vi { color: #008080 } /* Name.Variable.Instance */
.highlight .il { color: #009999 } /* Literal.Number.Integer.Long */
.pl-c {
    color: #969896;
}

.pl-c1,.pl-mdh,.pl-mm,.pl-mp,.pl-mr,.pl-s1 .pl-v,.pl-s3,.pl-sc,.pl-sv {
    color: #0086b3;
}

.pl-e,.pl-en {
    color: #795da3;
}

.pl-s1 .pl-s2,.pl-smi,.pl-smp,.pl-stj,.pl-vo,.pl-vpf {
    color: #333;
}

.pl-ent {
    color: #63a35c;
}

.pl-k,.pl-s,.pl-st {
    color: #a71d5d;
}

.pl-pds,.pl-s1,.pl-s1 .pl-pse .pl-s2,.pl-sr,.pl-sr .pl-cce,.pl-sr .pl-sra,.pl-sr .pl-sre,.pl-src,.pl-v {
    color: #df5000;
}

.pl-id {
    color: #b52a1d;
}

.pl-ii {
    background-color: #b52a1d;
    color: #f8f8f8;
}

.pl-sr .pl-cce {
    color: #63a35c;
    font-weight: bold;
}

.pl-ml {
    color: #693a17;
}

.pl-mh,.pl-mh .pl-en,.pl-ms {
    color: #1d3e81;
    font-weight: bold;
}

.pl-mq {
    color: #008080;
}

.pl-mi {
    color: #333;
    font-style: italic;
}

.pl-mb {
    color: #333;
    font-weight: bold;
}

.pl-md,.pl-mdhf {
    background-color: #ffecec;
    color: #bd2c00;
}

.pl-mdht,.pl-mi1 {
    background-color: #eaffea;
    color: #55a532;
}

.pl-mdr {
    color: #795da3;
    font-weight: bold;
}

.pl-mo {
    color: #1d3e81;
}
.task-list {
padding-left:10px;
margin-bottom:0;
}

.task-list li {
    margin-left: 20px;
}

.task-list-item {
list-style-type:none;
padding-left:10px;
}

.task-list-item label {
font-weight:400;
}

.task-list-item.enabled label {
cursor:pointer;
}

.task-list-item+.task-list-item {
margin-top:3px;
}

.task-list-item-checkbox {
display:inline-block;
margin-left:-20px;
margin-right:3px;
vertical-align:1px;
}
</style>
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<h1 id="css-">CSS水平垂直居中</h1>
<p>有一个 <code>div#wrapper</code> 元素，高、宽度都未知。它其中有一个宽高都为 <code>100px</code> 的 <code>div#box</code> 元素，请你完成 <code>CSS</code>，使得 <code>div#box</code> 在 <code>div#wrapper</code> 内水平、垂直方向居中。</p>
<p><strong>常规答案</strong></p>
<p><p class="codepen" data-height="265" data-theme-id="0" data-default-tab="css,result" data-user="whjin" data-slug-hash="aXNJbN" style="height: 265px; box-sizing: border-box; display: flex; align-items: center; justify-content: center; border: 2px solid black; margin: 1em 0; padding: 1em;" data-pen-title="水平垂直居中"><br>  <span>See the Pen <a href="https://codepen.io/whjin/pen/aXNJbN/"><br>  水平垂直居中</a> by whjin (<a href="https://codepen.io/whjin">@whjin</a>)<br>  on <a href="https://codepen.io">CodePen</a>.</span><br></p></p>
<script async src="https://static.codepen.io/assets/embed/ei.js"></script>

<p><strong>方法一</strong></p>
<p><p class="codepen" data-height="300" data-theme-id="0" data-default-tab="css,result" data-user="whjin" data-slug-hash="bzpgVr" style="height: 265px; box-sizing: border-box; display: flex; align-items: center; justify-content: center; border: 2px solid black; margin: 1em 0; padding: 1em;" data-pen-title="水平垂直居中1"><br>  <span>See the Pen <a href="https://codepen.io/whjin/pen/bzpgVr/"><br>  水平垂直居中1</a> by whjin (<a href="https://codepen.io/whjin">@whjin</a>)<br>  on <a href="https://codepen.io">CodePen</a>.</span><br></p></p>
<script async src="https://static.codepen.io/assets/embed/ei.js"></script>

<p><strong>方法二</strong></p>
<p><p class="codepen" data-height="300" data-theme-id="0" data-default-tab="css,result" data-user="whjin" data-slug-hash="OdNWMp" style="height: 265px; box-sizing: border-box; display: flex; align-items: center; justify-content: center; border: 2px solid black; margin: 1em 0; padding: 1em;" data-pen-title="水平垂直居中2"><br>  <span>See the Pen <a href="https://codepen.io/whjin/pen/OdNWMp/"><br>  水平垂直居中2</a> by whjin (<a href="https://codepen.io/whjin">@whjin</a>)<br>  on <a href="https://codepen.io">CodePen</a>.</span><br></p></p>
<script async src="https://static.codepen.io/assets/embed/ei.js"></script>

<p><strong>方法三</strong></p>
<p><p class="codepen" data-height="300" data-theme-id="0" data-default-tab="css,result" data-user="whjin" data-slug-hash="gqrgwg" style="height: 265px; box-sizing: border-box; display: flex; align-items: center; justify-content: center; border: 2px solid black; margin: 1em 0; padding: 1em;" data-pen-title="水平垂直居中3"><br>  <span>See the Pen <a href="https://codepen.io/whjin/pen/gqrgwg/"><br>  水平垂直居中3</a> by whjin (<a href="https://codepen.io/whjin">@whjin</a>)<br>  on <a href="https://codepen.io">CodePen</a>.</span><br></p></p>
<script async src="https://static.codepen.io/assets/embed/ei.js"></script>



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